用了spring-boot-starter-data-mongodb模块后，连接本机的Mongodb一直失败，用户也创建了，密码也设了，就是连不上啊。

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-mongodb</artifactId>
</dependency>

总是报错：

com.mongodb.MongoSecurityException: Exception authenticating MongoCredential{mechanism=null, userName='test', source='test', password=<hidden>, mechanismProperties={}}
    at com.mongodb.connection.SaslAuthenticator.wrapException(SaslAuthenticator.java:162)
    at com.mongodb.connection.SaslAuthenticator.access$200(SaslAuthenticator.java:39)
    at com.mongodb.connection.SaslAuthenticator$1.run(SaslAuthenticator.java:68)
    at com.mongodb.connection.SaslAuthenticator$1.run(SaslAuthenticator.java:46)
    at com.mongodb.connection.SaslAuthenticator.doAsSubject(SaslAuthenticator.java:168)
    at com.mongodb.connection.SaslAuthenticator.authenticate(SaslAuthenticator.java:46)
    at com.mongodb.connection.DefaultAuthenticator.authenticate(DefaultAuthenticator.java:32)
    at com.mongodb.connection.InternalStreamConnectionInitializer.authenticateAll(InternalStreamConnectionInitializer.java:122)
    at com.mongodb.connection.InternalStreamConnectionInitializer.initialize(InternalStreamConnectionInitializer.java:52)
    at com.mongodb.connection.InternalStreamConnection.open(InternalStreamConnection.java:127)
    at com.mongodb.connection.DefaultServerMonitor$ServerMonitorRunnable.run(DefaultServerMonitor.java:114)
    at java.lang.Thread.run(Thread.java:748)
Caused by: com.mongodb.MongoCommandException: Command failed with error 18: 'Authentication failed.' on server localhost:27017. The full response is { "ok" : 0.0, "errmsg" : "Authentication failed.", "code" : 18, "codeName" : "AuthenticationFailed" }
    at com.mongodb.connection.ProtocolHelper.getCommandFailureException(ProtocolHelper.java:164)
    at com.mongodb.connection.InternalStreamConnection.receiveCommandMessageResponse(InternalStreamConnection.java:295)
    at com.mongodb.connection.InternalStreamConnection.sendAndReceive(InternalStreamConnection.java:255)
    at com.mongodb.connection.CommandHelper.sendAndReceive(CommandHelper.java:84)
    at com.mongodb.connection.CommandHelper.executeCommand(CommandHelper.java:34)
    at com.mongodb.connection.SaslAuthenticator.sendSaslContinue(SaslAuthenticator.java:123)
    at com.mongodb.connection.SaslAuthenticator.access$100(SaslAuthenticator.java:39)
    at com.mongodb.connection.SaslAuthenticator$1.run(SaslAuthenticator.java:65)
    ... 9 common frames omitted

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